1 Scope
This standard specifies the requirements, such as the definition, models, parameters, structural types, technical requirements, test methods, inspection rules, marking and supply, etc. of metal sealing butterfly valves.
This standard is applicable to metal sealing butterfly valves with a nominal pressure PN=0.05MPa~500MPa and a nominal diameter DN=50mm~4000mm which are provided with wafer and flange connection.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication of this standard, all the editions indicated are valid. All the standards will be revised, and all parties using this standard are encouraged to study whether the latest edition of these documents is applicable.
GB 150-1989 "Steel Pressure Vessels"
GB 152 4-1988 "Fasteners-Counterbores for Hexagon Bolts and Nuts"
GB/T 1047-1995 "Nominal Size for Pipe Components"
GB 1048-1990 "Nominal Pressures and Test Pressures for Pipes and Pipe Line Accessories"
GB/T 1184-1996 "Geometrical Tolerancing-Geometrical Tolerances for Features without Individual Tolerance Indications"
GB 9113 1~9113 26-1988 "Integral Steel Pipe Flanges"
GB 9115 1~9115 36-1988 "Steel Pipe Welding Neck Flanges"
GB 9131-1988 "Pressure-Temperature Ratings for Steel Pipe Flanges"
GB 12220-1989 "General Purpose Industrial Valves-Marking"
GB 12221-1989 "Metal Valves for Use in Flanged Pipe Systems-Face-to-face and Centre-to-face Dimensions"
GB 12223-1989 "Part-turn Valve Actuator Attachments"
GB 12380 1~12380 4-1990 "Convex Integral Ductile Steel Pipe Flanges"
Foreword I
1 Scope
2 Normative References
3 Definition
4 Models and Parameters
5 Structural Types
6 Technical Requirements
7 Test Methods
8 Inspection Rules
9 Marking
10 Delivery
Appendix A (Informative) Calculation of Minimum Wall Thickness of Valve Body
